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      /*   
        do...while循环特点：先执行，再判断，至少执行一次
        do{
            循环操作
        }while(判断条件); 
        
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        var i=1;
        do{
            console.log("在跑操场第"+i+"次");//1  2 3  4  5
            i++;//2  3  4  5  6
        }while(i<=5);
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